Laravel One to Many Eloquent Relationship Example Tutorial

Laravel one to many eloquent relationship example; Through this tutorial, i am going to show you what is one to many eloquent and how to use one to many eloquent relationship in laravel apps.

A one-to-many relationship is a very basic type of database relationship. When one table refers to many rows in another table that is called a one-to-many relationship.

Laravel One to Many Eloquent Relationship Example Tutorial

• Create Migrations
  • posts table migration
  • comments table migration
• Create Models
  • Post Model
  • Comment Model
• Retrieve Records
• Create Records

Create Migrations

To create migration of “posts” and “comments” table. And add foreign key with posts table:

posts table migration

Schema::create('posts', function (Blueprint $table) {

    $table->increments('id');

    $table->string("name");

    $table->timestamps();

});

comments table migration

Schema::create('comments', function (Blueprint $table) {

    $table->increments('id');

    $table->integer('post_id')->unsigned();

    $table->string("comment");

    $table->timestamps();

    $table->foreign('post_id')->references('id')->on('posts')

        ->onDelete('cascade');

});

Create Models

To create Post and Comment table model. And use “hasMany()” and “belongsTo()” for relationship of both model.

Post Model

<?php


namespace App;


use Illuminate\Database\Eloquent\Model;


class Post extends Model
{
    /**
     * Get the comments for the blog post.
     */
    public function comments()
    {
        return $this->hasMany(Comment::class);
    }
}

Comment Model

<?php


namespace App;


use Illuminate\Database\Eloquent\Model;


class Comment extends Model
{
    /**
     * Get the post that owns the comment.
     */
    public function post()
    {
        return $this->belongsTo(Post::class);
    }
}

Retrieve Records

To fetch data using one to many eloquent relationship in laravel apps; as follows:

$post = Post::find(1);
 
$comments = $post->comments;
 
dd($comments);

$comment = Comment::find(1);
 
$post = $comment->post;
 
dd($post);

Create Records

To create data using one to many eloquent relationship in laravel apps; as follows:

$post = Post::find(1);
 
$comment = new Comment;
$comment->comment = "Hi Laratutorials.com";
 
$post = $post->comments()->save($comment);

$post = Post::find(1);
 
$comment1 = new Comment;
$comment1->comment = "Hi Laratutorials.com Comment 1";
 
$comment2 = new Comment;
$comment2->comment = "Hi Laratutorials.com Comment 2";
 
$post = $post->comments()->saveMany([$comment1, $comment2]);

$comment = Comment::find(1);
$post = Post::find(2);
 
$comment->post()->associate($post)->save();

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